reducing iwaki pump inlet/outlet

m3_arun · 01-05-2003, 08:07 PM

ive just ordered an iwaki MD30RZ. it has male threaded 3/4" inlet/outlet. i was wondering, how can i put 5/8" barbs on this? is there some kind of reducer/special fitting that will do this?

nikhsub1 · 01-06-2003, 09:17 AM

Can't wait to see how you like that pump, and where you're gonna put it! Anyway, just get some threaded barbs, I know home depot has them. Just make sure to use teflon tape on the threads.

m3_arun · 01-06-2003, 02:37 PM

you mean threaded on the inside?

bigben2k · 01-06-2003, 03:23 PM

You'll need a female-female adapter, since most barbs have a male connection. Otherwise if you can find the right barb, good for you!

Blackeagle · 01-06-2003, 06:33 PM

I'll be real interested in seeing any results you'd care to post here for us. Cathar's block is real good and that is one of the more powerfull pumps, be a great combo.

What size is the heater core? Or just post the Fedco # please.

bigben2k · 01-06-2003, 06:40 PM

M3_arun is planning on a chevette core.

Blackeagle · 01-06-2003, 07:06 PM

Thanks BigBen !

I'm real interested to see how his system performs.

m3_arun · 01-06-2003, 07:41 PM

ya i will keep everyone updated on any progress. i am sending the money for the pump today. ill be getting the block when cathar comes here to san jose.

BillA · 01-06-2003, 07:58 PM

do NOT restrict the pump inlet
feed it directly from a close-coupled res with a big pipe
pHaestus' res was/is excellent
try 1 1/2" Cu pipe with a bell reducer to 3/4 FNPT right at the pump inlet

bigben2k · 01-06-2003, 08:16 PM

Quote:

Originally posted by unregistered
do NOT restrict the pump inlet
feed it directly from a close-coupled res with a big pipe
pHaestus' res was/is excellent
try 1 1/2" Cu pipe with a bell reducer to 3/4 FNPT right at the pump inlet

I'm gonna throw a stupid question at that...

Volenti (?) mentionned (at OCAU) that measuring the pump head is different wether the pump is submerged or not: something to do with the water having to speed up into the pump inlet (when submerged).

My Q: is there such a thing as too big an inlet?

BillA · 01-06-2003, 09:37 PM

no
look at the distribution or resistances through the fluid circuit
what needs to be avoided is a (pointless and unnecessary) resistance at the pump inlet

centrifugal pumps are not designed to lift from the suction side

no idea what Violenti was referring to re the head
could be a measurement 'problem'

m3_arun · 01-06-2003, 09:38 PM

Quote:

feed it directly from a close-coupled res with a big pipe

why the pipe?

how about a res. built around the pump-inlet with a big hose barb? would that work?

BillA · 01-06-2003, 09:55 PM

"a res. built around the pump-inlet" sounds good; like what pHaestus did ?

where is this barb going to be ?
(not on a 5/8" hose connecting the res and the inlet I hope)

m3_arun · 01-06-2003, 10:08 PM

no i mean the barb coming out of the res.
would it be too restrictive to have a barb directly on the inlet?

Volenti · 01-06-2003, 10:22 PM

Quote:

Originally posted by unregistered
no
look at the distribution or resistances through the fluid circuit
what needs to be avoided is a (pointless and unnecessary) resistance at the pump inlet

centrifugal pumps are not designed to lift from the suction side

no idea what Violenti was referring to re the head
could be a measurement 'problem'

The measurement 'problem', is not having an accurate way to measure the flow in an in-line circuit, so all I can do is speculate about it

though a res may store the same energy as potential kenetic, so the 2 systems may end up having no advantage one over the other anyway...

Blackeagle · 01-22-2003, 02:16 PM

Found the FEMALE hose barbs you'll be wanting, in the proper sizes at Mcmaster-Carr.

Link www.mcmaster.com

Page 1 under barbed tube fittings

jtroutma · 01-22-2003, 02:28 PM

Billa is right about not restricting the inlet. Found that one out the hard way

That Sedra 3500A that I got was noisy as hell and after trying to work with it for about 2 months I gave up and bought an Eheim 1250. That Sedra had almost a 1" inlet and a 3/4" outlet! Tried to reduce it to a 5/8" inlet and a 1/2" outlet; the pump turned into the noisiest part of my whole setup (could not even hear my Sunon 108cfm fan over it)

Eventually I might use that pump for an external water chiller some day but till then it is collecting dust and I am enjoying the silence of the Eheim.

Skulemate · 01-22-2003, 03:51 PM

McMaster is exactly where I got my 3/4" NPTF x 5/8" Hose connectors, which I am using on my MD-20-RZT. The inside diameter of those fittings is exactly the same as the inner diameter of the inlet inside the 3/4" NPT connectors on my pump. I don't know about the 30, but I know that you can buy the 20 with a 5/8" barb to begin with.

m3_arun · 01-22-2003, 08:13 PM

thanks for the info, balckeagle and skulemate. ive been looking for those. will the 5/8" barbs be too restrictive or are they ok?

Blackeagle · 01-22-2003, 09:43 PM

I myself would use the larger 3/4" lines. And if you can manage it, fit wise, then I'd also run a large line from the res to near the pump like BillA suggested.

Anything to maintain a high flow rate.

m3_arun · 01-22-2003, 09:48 PM

Quote:

try 1 1/2" Cu pipe with a bell reducer to 3/4 FNPT right at the pump inlet

also can someone clarify on that? what is a bell reducer?

Skulemate · 01-22-2003, 11:57 PM

This is only a guess, but I would assume that it is an adapter that provides a smooth transition from one ID to the next. This would reduce the amount of losses in the fitting compared to a sharper transition (like those PVC ones you can get at Home Depot).

bigben2k · 01-23-2003, 09:18 AM

That would be correct.

A sharp transition is actually more restrictive. It can be googled with the terms: "orifice plate", but I haven't had a lot of luck with that.

pHaestus · 01-23-2003, 10:05 AM

hey skulemate:

I just opened Outlook and noticed an extremely old item in my todo list:

"mail Mike Robbins maxim ic"

Still interested in this?

Re: suction line restrictions

Might wanna read through this: http://www.cepmagazine.org/pdf/050252.pdf

Pretty clear reasons why not to.

bigben2k · 01-23-2003, 10:31 AM

Nice to see my homies published! (KBR is a division of the company I work for).

01-05-2003, 08:07 PM	#1
m3_arun Cooling Neophyte Join Date: Oct 2002 Location: san jose, ca Posts: 91	reducing iwaki pump inlet/outlet ive just ordered an iwaki MD30RZ. it has male threaded 3/4" inlet/outlet. i was wondering, how can i put 5/8" barbs on this? is there some kind of reducer/special fitting that will do this? __________________ AthlonXP 1800+ @ 135x11.5 Epox 8k5a2+ Antec SX830 case 256MB Micron PC2400 WC system soon... Iwaki MD-30RZ (getting fittings right now) Cathar WW block #102 (arrived) Heater core (still pondering) (still need to get tubing)

01-06-2003, 09:17 AM	#2
nikhsub1 c00ling p00n Join Date: Jun 2002 Location: L.A. Posts: 758	Can't wait to see how you like that pump, and where you're gonna put it! Anyway, just get some threaded barbs, I know home depot has them. Just make sure to use teflon tape on the threads. __________________ :-.,_,.-:'``':-.,_,.-:'``':-.,_,.-:'``':-.,_,.-:'``':-.,_,.-: E6700 @ 3.65Ghz / P5W DH Deluxe / 2GB 667 TeamGroup / 1900XTX PC Power & Cooling Turbo 510 Deluxe Mountain Mods U2-UFO Cube Storm G5 --> MP-01 --> PA 120.3 --> 2x DDC Ultras in Series --> Custom Clear Res "Artificial intelligence is no match for natural stupidity." 1,223,460+ Ghz Folding@Home aNonForums :-.,_,.-:'``':-.,_,.-:'``':-.,_,.-:'``':-.,_,.-:'``':-.,_,.-:

01-06-2003, 02:37 PM	#3
m3_arun Cooling Neophyte Join Date: Oct 2002 Location: san jose, ca Posts: 91	you mean threaded on the inside? __________________ AthlonXP 1800+ @ 135x11.5 Epox 8k5a2+ Antec SX830 case 256MB Micron PC2400 WC system soon... Iwaki MD-30RZ (getting fittings right now) Cathar WW block #102 (arrived) Heater core (still pondering) (still need to get tubing)

01-06-2003, 03:23 PM	#4
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	You'll need a female-female adapter, since most barbs have a male connection. Otherwise if you can find the right barb, good for you! __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

01-06-2003, 06:40 PM	#6
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	M3_arun is planning on a chevette core. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

01-06-2003, 06:33 PM	#5
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	I'll be real interested in seeing any results you'd care to post here for us. Cathar's block is real good and that is one of the more powerfull pumps, be a great combo. What size is the heater core? Or just post the Fedco # please.

01-06-2003, 07:06 PM	#7
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	Thanks BigBen ! I'm real interested to see how his system performs.

01-06-2003, 07:41 PM	#8
m3_arun Cooling Neophyte Join Date: Oct 2002 Location: san jose, ca Posts: 91	ya i will keep everyone updated on any progress. i am sending the money for the pump today. ill be getting the block when cathar comes here to san jose. __________________ AthlonXP 1800+ @ 135x11.5 Epox 8k5a2+ Antec SX830 case 256MB Micron PC2400 WC system soon... Iwaki MD-30RZ (getting fittings right now) Cathar WW block #102 (arrived) Heater core (still pondering) (still need to get tubing)

01-06-2003, 07:58 PM	#9
BillA CoolingWorks Tech Guy Formerly "Unregistered" Join Date: Dec 2000 Location: Posts: 2,371.493,106 Posts: 4,440	do NOT restrict the pump inlet feed it directly from a close-coupled res with a big pipe pHaestus' res was/is excellent try 1 1/2" Cu pipe with a bell reducer to 3/4 FNPT right at the pump inlet

01-06-2003, 09:37 PM	#11
BillA CoolingWorks Tech Guy Formerly "Unregistered" Join Date: Dec 2000 Location: Posts: 2,371.493,106 Posts: 4,440	no look at the distribution or resistances through the fluid circuit what needs to be avoided is a (pointless and unnecessary) resistance at the pump inlet centrifugal pumps are not designed to lift from the suction side no idea what Violenti was referring to re the head could be a measurement 'problem'

01-06-2003, 09:55 PM	#13
BillA CoolingWorks Tech Guy Formerly "Unregistered" Join Date: Dec 2000 Location: Posts: 2,371.493,106 Posts: 4,440	"a res. built around the pump-inlet" sounds good; like what pHaestus did ? where is this barb going to be ? (not on a 5/8" hose connecting the res and the inlet I hope)

01-06-2003, 10:08 PM	#14
m3_arun Cooling Neophyte Join Date: Oct 2002 Location: san jose, ca Posts: 91	no i mean the barb coming out of the res. would it be too restrictive to have a barb directly on the inlet? __________________ AthlonXP 1800+ @ 135x11.5 Epox 8k5a2+ Antec SX830 case 256MB Micron PC2400 WC system soon... Iwaki MD-30RZ (getting fittings right now) Cathar WW block #102 (arrived) Heater core (still pondering) (still need to get tubing) Last edited by m3_arun; 01-06-2003 at 10:22 PM.

01-22-2003, 02:16 PM	#16
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	Found the FEMALE hose barbs you'll be wanting, in the proper sizes at Mcmaster-Carr. Link www.mcmaster.com Page 1 under barbed tube fittings

01-22-2003, 02:28 PM	#17
jtroutma Cooling Savant Join Date: Aug 2001 Location: SLO, CA Posts: 837	Billa is right about not restricting the inlet. Found that one out the hard way That Sedra 3500A that I got was noisy as hell and after trying to work with it for about 2 months I gave up and bought an Eheim 1250. That Sedra had almost a 1" inlet and a 3/4" outlet! Tried to reduce it to a 5/8" inlet and a 1/2" outlet; the pump turned into the noisiest part of my whole setup (could not even hear my Sunon 108cfm fan over it) Eventually I might use that pump for an external water chiller some day but till then it is collecting dust and I am enjoying the silence of the Eheim. __________________ Athlon64 X2 4200+ @ 2.5Ghz (250FSB x 10) OCZ VX 1GB 4000 @ 250FSB (6-2-2-2 timmings) DFI LANParty nForce4 Ultra-D SCSI Raid 5 x (3) Cheetah 15K HDDs LSI Express 500 (128MB cache) OCZ PowerStream 520W PSU ATI X850XT PE (Stock) DTEK WhiteWater + DTEK Custom Radiator Eheim 1250

01-22-2003, 03:51 PM	#18
Skulemate Cooling Savant Join Date: Jul 2002 Location: Toronto, Canada Posts: 381	McMaster is exactly where I got my 3/4" NPTF x 5/8" Hose connectors, which I am using on my MD-20-RZT. The inside diameter of those fittings is exactly the same as the inner diameter of the inlet inside the 3/4" NPT connectors on my pump. I don't know about the 30, but I know that you can buy the 20 with a 5/8" barb to begin with. __________________ Michael E. Robbins M.A.Sc. Candidate, University of Toronto 12.1 GHz of AMD's finest (17.7 GHz total) crunching proudly for the AMDMB.com Killer Frogs SETI BOINC: Dual Opteron 246s (Iwill DK8N) \| XP2800+ (Shuttle SN41G2) \| 3x XP2400+ (ASUS A7N266-vm) SETI BOINC: 2x P4 2.8E (ASUS P4R800-vm) \| Crunching 24/7

01-22-2003, 08:13 PM	#19
m3_arun Cooling Neophyte Join Date: Oct 2002 Location: san jose, ca Posts: 91	thanks for the info, balckeagle and skulemate. ive been looking for those. will the 5/8" barbs be too restrictive or are they ok? __________________ AthlonXP 1800+ @ 135x11.5 Epox 8k5a2+ Antec SX830 case 256MB Micron PC2400 WC system soon... Iwaki MD-30RZ (getting fittings right now) Cathar WW block #102 (arrived) Heater core (still pondering) (still need to get tubing)

01-22-2003, 09:43 PM	#20
Blackeagle Thermophile Join Date: Oct 2002 Location: U.S.A = Michigan Posts: 1,243	I myself would use the larger 3/4" lines. And if you can manage it, fit wise, then I'd also run a large line from the res to near the pump like BillA suggested. Anything to maintain a high flow rate.

01-22-2003, 11:57 PM	#22
Skulemate Cooling Savant Join Date: Jul 2002 Location: Toronto, Canada Posts: 381	This is only a guess, but I would assume that it is an adapter that provides a smooth transition from one ID to the next. This would reduce the amount of losses in the fitting compared to a sharper transition (like those PVC ones you can get at Home Depot). __________________ Michael E. Robbins M.A.Sc. Candidate, University of Toronto 12.1 GHz of AMD's finest (17.7 GHz total) crunching proudly for the AMDMB.com Killer Frogs SETI BOINC: Dual Opteron 246s (Iwill DK8N) \| XP2800+ (Shuttle SN41G2) \| 3x XP2400+ (ASUS A7N266-vm) SETI BOINC: 2x P4 2.8E (ASUS P4R800-vm) \| Crunching 24/7

01-23-2003, 09:18 AM	#23
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	That would be correct. A sharp transition is actually more restrictive. It can be googled with the terms: "orifice plate", but I haven't had a lot of luck with that. __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

01-23-2003, 10:05 AM	#24
pHaestus Big Player Making Big Money Join Date: Aug 2001 Location: irc.lostgeek.com #procooling.com Posts: 4,782	hey skulemate: I just opened Outlook and noticed an extremely old item in my todo list: "mail Mike Robbins maxim ic" Still interested in this? Re: suction line restrictions Might wanna read through this: http://www.cepmagazine.org/pdf/050252.pdf Pretty clear reasons why not to.

01-23-2003, 10:31 AM	#25
bigben2k Responsible for 2% of all the posts here. Join Date: May 2002 Location: Texas, U.S.A. Posts: 8,302	Nice to see my homies published! (KBR is a division of the company I work for). __________________ WBTA (Water Block Testing Alliance) Nordic Hardware WC 101

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